Improvement in sharpening-machines



1. P. KEALY &1. RIGNEY. Sharpening-Machines.

No. 140,832, PatenmdJulJ/xmws.

AM, moro-L Hamm/c co. ux( osaanwe's PRacEss) UNITED 1 STATEs PATENTEEICE.

JAMES P. KEALY AND JOSEPH RIGNEY, OF BRIDGEPORT, CONNECTICUT.

IMPROVEMENT IN SHARPENlNG-MACHINES.

,Specification forming part of Letters Patent No. 140,832, dated July15, 1873 application filed March 29, 1873.

To all whom it may concern:

Be it known that we, JAMES P. KEALY and J osEPERIeNEY, of Bridgeport, inthe county of Fairfield and State of Connecticut, have invented a newand Improved Machine for Dressing Lathe-Centers, of which the followingis a specification:

The invention consists in the improvements of machines for dressinglathe-centers, as hereinafter described and pointed out in the claim.

Figure 1 is a side elevation of our improved machine for dressinglathe-centers with a part of the frame sectioned. Fig. 2 is a plan view.

Similar letters of reference indicate corresponding parts.

A is a small cast-metal frame, which is bolted at B to a support, C,having a socket-piece, D, attached to fasten it on the end of a squarebar, E, which is to be fastened in the tool-post of `a lathe, so as tosupport the frame relatively to the center F of a lathe,as shown in Fig.2. y G is a mandrel, on which the grinding-disk H is arranged at one endprojecting beyond the frame. This mandrel is arranged in its bearings Iso that it can traverse forward and back the length of thepoint of thelathe center, and is geared by pinion K, through which it slides, withthe drivin g-wheel L on the counter-shaft M, which has a worm or screw,N, in which the teeth O on the side of the rim of the driving-wheel gearto turn it. The drivin g-wheel is mounted in bearings Q by its shaft R,and has crank-pin S for turning it. On the shaft R is a shifting-screw,T, with righthand threads U, and left -hand threads V, for driving thefeed-screw W by a worm on it. This screw T is fitted to slide on theshaft R to shift the threads U and V for The worm T bears at its endsagainst the shoulders A on the shaft R to be held in gear with the wormou the feed-screw. The frame is pivoted to the socket-piece D, so thatit can be turned to arrange the mandrel parallel with the side of thelathe-point to be dressed.

B represents a drill-holding attachment on the mandrel. G is a plate,and D a screw, comprising a clamp by which the machine is to be clampedon a bench or other support, to be used as a drilling-machine.

vHaving thus described our invention, we

claim as new and desire to secure by Letters Patent- The combination ofa traversing lathe-center grinder, aframe adapted for being supported inthe tool-post of a lathe, and an automatic feed-screw for traversing thegrinder,

the grinder and the feed-screw being actuated. independently of thelathe, substantially as specified.

JAMES P. KEALY. JOSEPH RIGNEY. Witnesses:

DAVID SHATTUCK, MICHAEL EBERHARD.

